page_title: HMS G9
hierarchical_section_title: HMS G9
caption_attribution_description: English: Photo of HMS G9 at Scapa Flow, 1917
context_page_description: HMS G9 was a British G class submarine, one of eight Royal Navy submarines known to have been lost to friendly fire in World War I.
context_section_description: HMS G9 was a British G class submarine, one of eight Royal Navy submarines known to have been lost to friendly fire in World War I.
caption: G9 at Scapa Flow.
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